Is the user synching with any other devices?
They didn't go add more than one category to their tasks did they? This is a flaw, if you assign more than one category they disappear, see this link if that's the case: http://forums.macrumors.com/showthread.php?t=1053657

YOu might try setting the user up on another system and see if the tasks appear, if so, it' s an outlook problem and solvable.

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matthenkelAuthor Commented: 2013-01-08

Ill check on the category idea . It does sync with an iPad an iPhone but has for sometime, they also access outlook on 2 laptops
and a term server and they are gone on all 3 devices